$$20+490+51$$

$$-5\cdot\left(-38+2\cdot\left(-24+47\right)\right)+2$$

$$\int-5xsin\left(-2x+1\right)dx$$

$$\frac{dy}{dx}=v\left(t\right)c\left(t\right)$$

$$x^4+6x^3+9x^2-4x-12$$

$$\lim_{x\to0}\left(\frac{2\sin\left(x^2\right)}{1-\cos\left(x\right)}\right)$$

$$\left(x^{2\:}-3\right)=2$$